#1Mild
London
- Day
- 19.6°C
- Sea
- -
- Sun
- 5.4h
- Rain days
- 10
Your June weather guide
Weather in United Kingdom in June
June is a good month for visiting the United Kingdom if you prefer mild weather to dependable heat. Country averages of 18°C by day and 12°C at night favour getting out and about, provided you bring layers. The catch is rain, with 11 rainy days on average, so keep outdoor plans flexible. London suits travellers wanting warmer afternoons; Cornwall is cooler, and its sea is better approached as a brisk dip than a warm swim.
Long-term climate averages, not a forecast · 1991-2020
- Average daytime high
- 18.5°Cacross 2 destinations
- Average night-time low
- 11.6°Cafter dark
- Sea temperature
- 14.0°Ccold for swimming
- Rainy days
- 11days1 mm or more
United Kingdom, month by month
Turn up the warmth
Warmest places in United Kingdom in June
Ranked by average daytime high. The full comparison is in the table below.
#2Mild
Cornwall
- Day
- 17.3°C
- Sea
- 14.0°C
- Sun
- 5.5h
- Rain days
- 12
United Kingdom destinations ranked for June
All 2 places we track in United Kingdom, ordered by daytime high.
June climate overview
Daytime highs across United Kingdom in June run from 17.3°C (Cornwall) to 19.6°C (London). Even in London only 6% of days reach 25°C. Nights average 11.6°C; the coldest 10% of nights in Cornwall fall to 10°C or below.
Rainfall in June
Expect around 11 rainy days (1 mm or more) in June, with London the driest (10 days) and Cornwall the wettest (12 days). The wettest June at London between 1991 and 2020 was 2012 with 133 mm; the driest was 1996 with 9 mm.
Sea temperature
The sea averages 14.0°C around United Kingdom in June. That is cold for swimming without a wetsuit.
Sunshine and daylight
Around 5.5 hours of sunshine a day on average, out of 16.4 hours of daylight (sunshine estimated from cloud cover).
June against the rest of the year in United Kingdom
June is the 3rd warmest month of the twelve in United Kingdom. It is 2.7°C warmer than May and 1.9°C warmer in July. The hottest month here is July (20°C) and the coolest January (8°C).
Which part of United Kingdom in June?
- Most sunshine: Cornwall, 5.5 h a day.
- Driest: London, about 10 rainy days.
- Warmest sea: Cornwall, 14°C.
- Hottest: London, 20°C by day.
- Coolest (better for walking and cities): Cornwall, 17°C.
What to pack for United Kingdom in June
Based on the averages: light layers - warm in the sun, cooler in the shade; a warm layer for evenings, when it drops to around 12°C; a rain jacket - roughly 11 wet days.
Similar weather elsewhere in June
Within 1.5°C of United Kingdom's June daytime average: Amsterdam (19°C, sea 17°C). See the full ranking for June.
London or Cornwall?
London is the warmer choice, averaging 20°C by day compared with Cornwall's 17°C. That makes it a better fit if you want comfortable outdoor afternoons without relying on hot weather. London also has slightly fewer rainy days, though the difference is not enough to leave waterproofs behind. Cornwall suits travellers who are happy with cooler coastal weather and do not need swimming to be the focus of their holiday. Its sea averages 14°C, so a wetsuit is worth considering if you plan to spend time in the water. Evenings need a layer in either destination: Cornwall averages 12°C at night and London 11°C.
What to expect and pack
Plan for mild days rather than a reliably hot summer break. The country averages 5.5 hours of sunshine, but that is not a promise of clear skies throughout the day. Light clothing with a jumper and waterproof jacket gives you more flexibility than packing only for sunshine. With rain possible during your stay, leave room to move outdoor plans around rather than fixing everything in advance. You do not need to organise the whole trip around avoiding midday heat, although warmer spells can happen. Keep an extra layer handy for evenings, especially if you intend to stay outside after the daytime warmth fades.
A little more detail
United Kingdom in June FAQs
Plain answers, grounded in the averages.
Where is the hottest place in United Kingdom in June?
London is the warmest of the 2 places we track in United Kingdom in June with an average high of 19.6°C; Cornwall is the coolest at 17.3°C.
Is the sea warm in United Kingdom in June?
Not really: the warmest sea we track in United Kingdom in June is 14.0°C at Cornwall, below the 22°C most people find comfortable.
Is June hot in the United Kingdom?
June is generally mild rather than hot. London, the warmer option here, averages 20°C by day, with temperatures above 25°C on just 6% of days. Pack for comfortable daytime weather, but do not count on sustained heat.
Is the sea warm enough for swimming in Cornwall?
Cornwall's sea averages 14°C in June, so expect cold water rather than a warm swim. A short dip may suit you if you tolerate the cold, but consider a wetsuit for spending longer in the water.
Should I expect rain during a June holiday?
It is sensible to plan for some rain. The country averages 11 rainy days in June, compared with 10 in London and 12 in Cornwall. Those figures do not mean continuous rain, but waterproofs and flexible outdoor plans are useful.
About these averages
ERA5-Land climate reanalysis via Open-Meteo (11 km grid), 1991-2020
Averages computed from daily values at 2 destination points.Records are the highest and lowest daily values in that 30-year period, not all-time records. These are climate averages, not a forecast for your trip. How we measure holiday weather
- Hot · 25°C+
- Warm · 20°C to below 25°C
- Mild · 15°C to below 20°C
- Cool · below 15°C